IMO this is a great defense team once all those heroes are maxed:
Scarlett | Triton | Wilbur | Rigard | G. Jackal
Wilbur and Rigard next to each other have good synergy, the other three have fast skills and high attack stats. Good mix of defense and offense here.
Offense teams are different for every situation. You will have a different team for each color of titan you fight if you’re in an alliance, and different offensive teams for each of the different levels in the campaign.
Why do you think Wilbur is better tank than Rigard? And what sinergy do you mean with them?
Wilbur has better defense and skill suitable for tank position. The slightly higher defense matters because it lets him take more hits, and his spirit link + defense buff is very effective at minimizing damage across your team, meaning he will last longer than Rigard if he fires his skill.
Rigard is a pure healer, putting him in the center isn’t very good because he’s likely gonna get killed first and it eliminates your team’s only source of healing. On the flank he supports Wilbur, and it is more likely that he’ll have a chance to heal your team when it matters.
Wilbur and Scarlett is a good stacking.
For a rainbow team, Berden with emblem could stay a little longer too.